I have 26,000 on my 2012 GC Overland Summit and at the last oil change, the dealer told my brake fluid was changing colors and will need to be changed next visit.

I have NEVER heard of brake fluid needing changing in one year before.

Am I missing something?

I believe it says every two years. Just because the fluid has allegedly changed color is no reason to change. If you GC has seen hard use ie towing or has been in very humid environment then changing more frequently maybe in option.

Depending on how hard the vehicle is used brake fluid can be changed as often as before a track weekend or between track sessions. Again depends on how hard the brakes were used etc.

Dont know the wet boiling point of the OEM brake fluid in our GCs??? For severe use I would recommend ATE Blue and Gold. Or even good ole Castrol. No need for high buck fluids. Wet boiling point is the most important for brake fluid. Dont use silicon brake fluid ever in your GC. Also avoid some racing brake fluids because they are very hydroscopic ie attract water and are made to be changed before every race.

I have 26,000 on my 2012 GC Overland Summit and at the last oil change, the dealer told my brake fluid was changing colors and will need to be changed next visit.

I have NEVER heard of brake fluid needing changing in one year before.

Am I missing something?

Most places use a copper test strip that is dipped into the brake fluid,the more purple the strip turns after 90 seconds the more copper is present which is corrosion is the system.Anything above 200ppm is a required change.With ABS systems maintaining brake fluid is very important where as 30 years ago it was not a big concern.

How easy is to flush the brakes on a WK2? I just changed my brake pads at 50K miles and I know it's time to flush the system 3 yrs.

Same as any vehicle,can do it many ways depending on your budget.I use a vacuum bleeder but you can do the old way of having someone pump and hold,then you open the bleeder,repeat till the fluid comes out clear.As usual you start at the RR,then LR,then RF,and finally the LF and check and refill the master cylinder often.